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Debt and Available Credit Facilities (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Oct. 31, 2020
Oct. 31, 2019
Oct. 31, 2020
Oct. 31, 2019
Apr. 30, 2020
Jul. 31, 2019
May 30, 2019
Components of Total Debt Outstanding [Abstract]              
Short-term portion of long-term debt [1] $ 12,500   $ 12,500   $ 9,375    
Total long-term debt, less current portion 825,243   825,243   765,650    
Total Debt 837,743   837,743   775,025    
Amended and Restated RCA [Member]              
Debt and Available Credit Facilities [Abstract]              
Costs incurred           $ 4,000  
Credit agreement issuance costs capitalized           5,200  
Amortization expense of the lender and non-lender fees in interest expense 300 $ 300 500 $ 500      
Term Loan A Facility [Member] | Amended and Restated RCA [Member]              
Components of Total Debt Outstanding [Abstract]              
Total long-term debt, less current portion [2] 229,096   229,096   235,263    
Unamortized issuance costs 600   $ 600   700    
Debt and Available Credit Facilities [Abstract]              
Term of credit facility     5 years        
Credit agreement face amount             $ 250,000
Credit agreement issuance costs capitalized           900  
Term Loan amount related to lender fees as a reduction to debt           800  
Term Loan amount related to non-lender fees in Other NC Assets           100  
Revolving Credit Facility [Member] | Amended and Restated RCA [Member]              
Components of Total Debt Outstanding [Abstract]              
Total long-term debt, less current portion 596,147   $ 596,147   $ 530,387    
Debt and Available Credit Facilities [Abstract]              
Term of credit facility     5 years        
Amount of financing available under credit facilities             $ 1,250,000
Credit agreement issuance costs capitalized           $ 4,300  
Revolving Credit Facility [Member] | Syndicate Bank Group led by Bank of America [Member] | Amended and Restated RCA [Member]              
Debt and Available Credit Facilities [Abstract]              
Optional credit limit increase available on request 500,000   $ 500,000        
Minimum increments in which optional credit limit increase may be requested $ 50,000   $ 50,000        
Revolving Credit Facility [Member] | Syndicate Bank Group led by Bank of America [Member] | Amended and Restated RCA [Member] | Minimum [Member]              
Debt and Available Credit Facilities [Abstract]              
Line of credit facility fee percentage     0.15%        
Revolving Credit Facility [Member] | Syndicate Bank Group led by Bank of America [Member] | Amended and Restated RCA [Member] | Maximum [Member]              
Debt and Available Credit Facilities [Abstract]              
Line of credit facility fee percentage     0.25%        
Revolving Credit Facility [Member] | Syndicate Bank Group led by Bank of America [Member] | Amended and Restated RCA [Member] | LIBOR [Member] | Minimum [Member]              
Debt and Available Credit Facilities [Abstract]              
Applicable margin     0.98%        
Revolving Credit Facility [Member] | Syndicate Bank Group led by Bank of America [Member] | Amended and Restated RCA [Member] | LIBOR [Member] | Maximum [Member]              
Debt and Available Credit Facilities [Abstract]              
Applicable margin     1.50%        
Revolving Credit Facility [Member] | Syndicate Bank Group led by Bank of America [Member] | Amended and Restated RCA [Member] | Base Rate [Member] | Minimum [Member]              
Debt and Available Credit Facilities [Abstract]              
Applicable margin     0.00%        
Revolving Credit Facility [Member] | Syndicate Bank Group led by Bank of America [Member] | Amended and Restated RCA [Member] | Base Rate [Member] | Maximum [Member]              
Debt and Available Credit Facilities [Abstract]              
Applicable margin     0.50%        
Revolving Credit Facility [Member] | Syndicate Bank Group led by Bank of America [Member] | Amended and Restated RCA [Member] | Federal Funds Effective Rate [Member]              
Debt and Available Credit Facilities [Abstract]              
Margin rate over reference rate used in determining base rate     0.50%        
Revolving Credit Facility [Member] | Syndicate Bank Group led by Bank of America [Member] | Amended and Restated RCA [Member] | Eurocurrency Rate [Member]              
Debt and Available Credit Facilities [Abstract]              
Margin rate over reference rate used in determining base rate     1.00%        
[1] Relates to our term loan A under the Amended and Restated RCA.
[2] Amounts are shown net of unamortized issuance costs of $0.6 million as of October 31, 2020 and $0.7 million as of April 30, 2020.